package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    //微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    /*
    * 微信登录
    * */
    @Override
    @Transactional
    public User wxLogin(UserLoginDTO userLoginDTO) {

        String openid = getOpenid(userLoginDTO.getCode());

        //判断openid是否为空，为空则登陆失败，抛出异常
        if(openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        User user = userMapper.getByOpenid(openid);
        //判断当前用户是否为新用户
        if(user == null){
            //为新用户则自动完成注册
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        //返回用户对象
        return user;
    }

    /*
    * 调用微信接口服务，获取openid
    * */
    private String getOpenid(String code){

        //调用微信接口服务，获取当前用户的openid
        Map<String,String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }

}
